<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
   
    <div id="app">
         <input type="button" value="添加" @click="add">
        <input type="button" value="移除" @click="remove">
        <ul>
            <li v-for="(item,index) in arr">
               {{index+1}}:{{item}}
            </li>
        </ul>
        <h2 v-for="item in learn" :title="item.name">
            {{item.name}}
        </h2>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app=new Vue({
            el:"#app",
            data:{
                arr:['c','c++','java','python'],
                learn:[
                    {name:'学校'},
                    {name:'网络'}
                ]
            },
            methods:{
                add:function(){
                    this.learn.push({name:'学小易'})
                },
                remove:function(){
                    this.learn.shift()
                }
            }
        })
    </script>
</body>
</html>